Stop-motion for high-speed machines.



A. W. PROCTOR, DECD.

v G. H. PROCTOR. ADMINISTRATRlX. 7 STOP monow FOR HIGH SPEED MACHINES.

APPLICATKDN FILED DEC'ZQ. 1915. l I

Patented Nov. 15, 1917.

a snEzTs-snan'z.

A. W, PROCTOR, DECD.

G. H. PROCTOR, ADMHHSTRATMX.

STOP MOTION FOR men SPEED MACHINES.

APPLICATION FILED DEC. 29. i915 Eatented Nov. 13, 1917.

8 SHEETS-SHEET 3.

M J M R. W. PEOCTOH, DEBS.

s. H. PROCTOR, Amnmsmm mx.

SIOP NOD01! FOR HiGH SPEED MACHINES.

APPLICATION mm DEC. 29. 1915.

LWWQ;

c 1 S @W Kim? A. w. Panama, DECD.

a. u. PROCTGR. Aomsmsmmmx. STOP MOHON FM HIGHSPEED MACHiNES.

APPucAH'm: FILED 050.29. 1915.

Patent-ed Nov. 13, 39W,

8 SHEE S-main e.

v 5] muemfoz gwi (Jo 6M r A. W. PROCTOR, DECD.

e. H. PROCTOR, KDMINISTRATRIX.

STOP MOTIION FOR HIGH SPEED MACHINES.

APPLICATION FIILED DE'c.29.'19|s.

Patented Nov. 13, 1917.

8 SHEETSSHEE-T B.

3 wvewtcvo %13 attoqmegs m x v M -W:

UNITED STATES. PATENT OFFICE,

ALFRED W. PROCTOR, OF BROOKLYN, NEW YORK;.GEORGIETTA PROCTOR, 0F BROOK- LYN, NEW YORK, ADMINISTRATRIX OF SAID ALFRED W. PROCTOR, DECEASED,

ASSIGNOR, BY MESNE ASSIGNMENTS, TO FRANCIS A. SHEA, OF BOSTON, MASSA- CHUSETTS.

STOP-MOTION FOR HIGH-SPEED MACHINES.

Specification of Letters Patent.

atented Nov. 13, 1917.

To all whom it may concern:

Be it known that'I, ALFRED W. Pnooron, a :itizen of the United States, residing at Brooklyn, in the county of Kings and ,State of New. York, have invented certain new and useful "Improvements in Stop-Motions for High-Speed Machines, of which the following is a' specification, reference being had therein to the accompanying drawing.

This invention relates-to a stop motion for high speed machines, being a device for bringing a rotating shaft in a machine to a condition of rest without shock, further accomplishing this in a brief period of revolution of the shaft and in a very short period of time, and further bringing the shaft to rest in a definite position, angularly considered. Among the principal objects of the invention are the following.

One object of the invention is to absorb the momentum of the rotating shaft, which momentum may be considerable by reason of heavy moving parts in the machine, such as wheels, gears, cams and reciprocating elements, without giving any severe shock to any of the parts of the machine or of the stop motion. It will be understood that either high speed moving parts in a machine or heavy parts in a machine have considerable momentum and inertia, and any attempt to check the motion suddenly may be productive of considerable wear and tear, if not actual breakage.

A further object of the invention is to reduce the speed of the driven shaft automatically; that is, without either more thought or attention on the part of the operator of the machine than movingxa handle or pedal, but without any necessity of a sudden or quick movement, or,- on the other hand, a slow movement, on any particular kind of controlling manipulation. 'The attention of the operator of the machine is necessarily'largely concerned with its regular purpose of operation, as sewing, printing, or the like, and it is desirableto make the stopping automatic in the sense of being independent of any particular manipulation on his part. Whenever stoppage is desired, a simple manipulation should bring it about, however artless or unskilled or variable such manipulation may be at different times with different. operators and under different, circumstances of stoppage.

A further object of the invention is to provide for the, unvarying stoppage of the machine at a given point of action, corresponding to a given angular position ofthe driven shaft to whichthe stop motion is conveniently attached. In a considerable number of arts, as in sewing and printing machines, and in many classes of shoe inachinery not particularly connectedfwith sewing, the importance of having'the machine stop at a definite position is well 1111-,

derstood. The present stop motion is de signed to faithfully carry out this service.

A further object of the invention to secure the stoppage in very brief space of tlmeand amount of revolution. it being evi* dent that any continuing period of running with reducing speed is productive ofloss of time, and some uncertainty in the final point of stoppage which must be estimated by the operator in advance; In accordance with the present device, stoppage is effected in a fractionof a revolution of the driven shaft.

Another obje ctbf the invention is to effect starting of the machine to which .the stopv springs or like devices liable to varying degrees of tension and-breakage, and liable to uncertain action from the'effects'of guimny oil, or temperature of the air. And in addition to this it is'one of the important aspects of the present invention to avoid the use of any brake or reliance upon the uncertain-effects of frictional sliding, which vary greatly from the effects of wear, pressure,

dampness, minute specks of oil, rust and differentand innumerable causes. In other words, the presentinvention is designed to be, sofar as possible. ahsolutelyindependent in its action of any devices capable -of uncertain action. such as have been enumerated, or'other forces like gravity, or even momentum. The plQSQllt device is adapted to secure the control of the driven shaft by the inherent strength of 30 locking 50 the shaft A,

its materials as driven-through the powerv of the prime power source or-engine. hus, the proper action is insured except for the possibility" of actual breakage of the parts,

which, however, may be made so strong as to preclude breakage. In this way the stop motion is made sufficiently proof against supervision that it maybe put out attached to a macl1ine for long periods of service without 16 any attention, or-even' knowledge of its action, by the, user of the machine. Asa fun. ther part of this object the stop motion is made compact and strongly housed with all the working parts inclosed, and running in grease'or oil which is contained'within the casing and which will i emainj without' replenishing for a long period, 'likethe grease in'a. familiar automobile differential or gear box. A still further object of the invention is to; make all the parts,- so far 'as possible, interlocking, so that no accidental cause can produce any improper movement By'accidental causes one mightimagine a backward turning of the machine, or a sudden heavy overload, due a); the machine being suddenly arrested by being clogged. These -accidental',,causes. m ght produce abnormal tendencies t action 1n-the stop .motion, an the latter isftherefore, made entirely interthroughout to forestall" any improper action from thiscause.

- Other objects-are to provide a stop motion which is readily adaptable off-machines, 6., to extremely rapid rotat'tionas with buttonhole sewing machines, or

Y to comparatively slow machines, if desired,

which may have much heavier parts, thereby having. considerable inertia in spite of the slow ipeed, It a' further object to provide a device which has only a few necessary parts, -which are inherently strong so as not to require highly refined materials and construction.

' 'With these objects in viewthe improved stop motion consists in the features of construction and combination hereinafter pointed out. ."gIn the drawings it will be understood that *the stop motion is connected to a machine at this being the shaft in the'machine which is to be started and stopped. as above described, and which shaft has been known in the stop motion art as a driven shaft in the machine. X is a driving pulley which rotates continuously as by connection with a line shaft in the factory or with an electricmotor, and corresponds to what is 4 known in the stop motion art as shaft.

Figu

the driving re 1 is a side elevation, viewed from the pulley side, with the cover plate at this end, and also the rotating parts, removed, and further partly in sectlon, of a stop motion embodying the principles of this invention.

to a wide range.

wee-sea Fig. 2 is a diagrammatic View illustrative of some of the main principles of the action.

Fig. "-3 shows-the. outline of a form of cam which may be advantageously used.

F ig is a top planview 'of the casing and certain parts in section, and particularly showing the rotating parts in their normal positionwhile-the machine is running, of the stop motion'of Fig. 1. I

Fig. 5 is a'verticalsectional view of the same. I Fig. 6 is a sectional view loo-king downward on the general planeVL-NI of Fig. 1 and showing the parts in one phase ofthe starting action, a, about 60 after the initial commencement thereof.

Fi is a section taken on the line VHVIl of Fig. 0, theparts being in the same position.

F'g. 8 is a section on. the line VHF-VH1 of Fig. 7 looking in the direction of the Fig. 9 is a section through the casing on the line l X-1X'of Fig. 6, but the movable parts are in the phase corresponding to the stopping of the machine, 6., 60 after the initial commencement thereof.

Fig. 10 is a diagrammatic viewwhich may be taken to supplement Fig. 9, being the position of the parts 60 earlier or at the original inception ofthe stopping action of the machine. v

Fig. 11 is a diagrammatic view which may be similarly showing the position of the parts 120 later than Fig.9, or when the stopping has been fullybrought about. The stop motion parts are, however, not fully brought to normal position in Fig. 11, which occurs within the next 30 of rotation.

Fig. 12- is a diagrammatic view which may be taken to supplement Fig. 7, being the position of the parts 60 earlier or at the original inception of the starting action of the machine.

Fig. 13 is a diagrammatic view which may be similarly taken to supplement Fig. 7.

. showing the position of the parts 120 later than Fig. 7, or when the starting has been fully brought about. The stop motion parts are, however, not fully-brought to normal position in Fig. 13, which occurs within the next 30 of rotation.

Fig. 14: is a side elevation, with the end plate partly broken away, from the pulley end of the machine.

Fig. 15 is alongitudinal sectional view through he main cams of the machine showing the driving shaft in side elevation, and particularly showing the arbor on which these cams slide longitudinally of the driving shaft in splined relation thereto.

Fig. 16 is a section on the line XVIXVI of Fig. 15 looking in the direction of the arrows.

taken to supplement Fig. 9

Reference being had to Fig. 2, it Will be understood thatv this is a diagrammatic view in which A indicates a crank disk on the driven shaft A and having a crank pin (1.. The crank pin (1 works in an oval or slotted link or crank .1, which is fixed to or integral with a part of the driving shaft X and pulley X. These features, being somewhat. primary in the operation of the stop motion, will receive first. attention as to their operation, after which the further details can be more readily understood.

' The slotted link a, which, of course, may have any convenient practic l form to per- 5 form the functions hereinafter described of a slotted link on the driving shaft, may rotate on an axis which is coaxial with the driven shaft A, this being the condition in full lines in Fig. 2. Under these conditions 28 the driving pulley and shaft X rotate the link .it'. and this in turn carries around the crank pin a, which, being a part of the driven shaft A, revolves the latter. The arrangement is, in fact, a direct connection '5 or' coupling between the driving and the driven shafts, and the latter is rotated with the whole power of the engine through this.

direct mechanical connection. This i"otation will continue as long as the driving and driven shafts malntain this concentric or axial relation to one another. if, however. at the instant when the par s-are in the position shown in Fig. in full lines, 2'. 6.. with the crank a and slotted linker extending in the vertical direction marked 1, an action is brought about by which the axis of the driving pulley and shaft X will be moved toward the right, or in the direction marked 2, and at such a speed that the.

slotted link reaches the position shown in dot-and-dash lines m at the time it extends in direction 2, it will be found that the driven shaft. has during this interval been completely brought to rest, It will be found that the driven shaft has further been brought to rest by a gradual motion which is substantially harmonic or ideal in character, that is to say, by such a motion as gives the quickest possible stoppage with the least possible shock or wear and tear. is will be understood by those familiar l mechanics, a motion known as a ially accelerated or retardeo motion, h is adapted to produce ve quick iages of parts having l mom ntum inertia without there .1 sound, or wear and tear resulting thereif the slotted, link U continues o an on the new axis 0 it may do so con- 1, outthe driven shaft will not be driven. .a th; "ont-rary, the driven shaft will he locked at its position of stoppage,

is a r sition Wherethe crank a is location 0 Thus, the comnascent scan d iuously andatits original speed of rota plete action has been a prompt termination of the rotation of the driven shaft, but wlth- 'out any shock, the cessation of motion being torv, which is not adapted to stop or have any varying movement. The only change that needs to be mentioned is the change oi location of the driving shaft and pulley X, this having been shifted from the axis 0' to the axis 0 It now being understood that the driven shaft is stopped, starting is efiected' by a procedure which is analogous to the stop-- ping, but reversely directed in its clients, From the position :0 the link x is supposed to be moved to the position m by which its axis of rotation rnovesback from 0 to 0, while it is traversing about to a posi tion 3. By this action the first. considered. relations are restored and the driven, shat-t is directly coupled to the driving shaft and it continues to rotate as long as this couplingis continued. Thus, the machine is started in av prompt, but gradual, manner, having'afa similar principles of quietness and freedom from shock to the stopping action.

All this general principle of stop motion now being familiar, it can be stated that the main portion of the mechanism, as here- 1% inattei; described, is concerned with securing the motion or the pin a and the link a? as described. Oneniodification requires mention, however,- in' that, instead of the commencement of the stopping action being at the angle marked 1, a start is made 30 earlier at the angle marked 1. Similarly, instead of the commencement of the starting being at the angle marked 2, the commencement is made 30 earlier or at the lie angle marked 2. This is done to secure slightly more time and opportunity to get the parts in, proper relation before the proper action really begins. It will be.

found that this advance of SO in each case doesnot sensibly alter the relations as al-. ready described, for the reason that 30- is not angle enough to make any particular difference in this action, either from the {oping the driven shaft or U draneing the angle 39, however e, there is a range of 120 illSi during which both the starting and stopping of the driven shaft takes place. In addition to this period of 120, there is a further interval of 90 added on, as will be later described, 60 being added on at the inception and 30 at the conclusion of both starting and stoppin actions. Thus,- in the practical embodiment-134 the center is and the radius 70p.

multaneously while in action and maintain this engagement through the entire period of the shifting of the driving shaft from one axis to another. Thus. the driving shaftin its movement from one axis to ado't-her is positively controlled and it is not possible for the driving'shaft to rattle or .thermore, this movement is so contrived by:

the cams that. it starts at zero velocity, mounting by true harmonic motion to -a fined maximum. and then immediately rev rsing, but without change of velocit at the monieiitfof reverse, or in any abrupt way, then descending by true harmonic motion again to zero.

shaft from one axis to the other, and no shock at,the cessation of the increase of veiinally no shock at the last instant where the form of am. In other words, the distance as 00 is equal. to the distance between the cent rs 0" and 0 of Fig.2.. This form of cam gives all of the results as to 120 of active operation and the start with Zero velocity,

the stop at zero velocity and the mergencc 35 at common velocity of the accelerating and retarding curves, which was first described above as desirable.

Reference now being had to the Figs.

and 11. the general action of the cam just 81 described may be conveniently observed. it must be assumed that the cam has been somehow brought into such a plane as to cooperate with the-cheek or wear plate 16,

shown in Fig. 9. At this instant, as shown 85 in Fig. 9, the cam becomes effective to force Thus, there is no shock the driving shaft bodily in its movement of commencing the translation of the driving translation to the right.

a It should, there fore, at this time have attained a good firm engagement with the cheek or wear plate 16. W locity and commencement of decrease, and"This:is accomplished by an action for the 60 of rotation of the driving shaft which driving shaft arrives at its second axis. This has just been completed in Fig.9; in other is to be regarded as an important point, inwerds, with that period which has its coreasmucli-as a motion which lacked thesecharmencement in the position of Fig. 10. in 9,5

other words, between the conditions of Fig.

acteristics in anyone of the points just inen- 'zioned would mean a shock or blow in the device at such a time, when the stop motion was used with a high speed machine. This shock, ofcourse, would not-be due to change in angular rotative movement of any of the parts, but rather totoo sudden change of the motion of translation of the driving shaft from one axis to the other. By the form of cam illustrated in Fig. 3, any liability of shock from this cause is utterly overcome. This is'also true because the motion is'a true harmonic motion at every iiistant. It is well known that harmonic motion is practically identical with a uniformly accelerated and retarded motion.

The axis of rotation of the cams 20, 21 is 10 and Fig. 9, the cam has been shifted laterally of itself, or longitudinally on the driving shaft X so as to be brought .opposite/ the cheek orwear plate 16. shift occurs during of rotation of the cam, starting with that position shown in Fig. 10 and ending with that position shown in Fig. 9. .Fig. S commences the further movement of the c am. which exerts definite 1% pushing force against-the cheek 16 and coir tinues fora period of 120, or until the position shown in Fig. 11. At this time the .--translation of the driving shaft to its new axis 0 is accomplished. This will be seen by comparing Figs. 10 and 9 with Fig. 11. It does not appear to be necessary to analyze at the point 0, (see Fig. 3). which is one an-- --the curves gfjhe cam in conjunction with gle of a 30"-and-6O triangle 07aZ. The-center Z is the center of curvature of the quadrants m and n of the cam, the radium Zm being. furthermore equal to the base Z10 of the triangle. A third port-ion p of the cam has A fourth portion 9 is in line with the side k0 of the main triangle first described. The portion 1' is concentric with the axis 0 and merges into tangency with the portion .n. The portion of the cam s is an are around the center is and tangent with the surface a. Thejflat face 25 of the cam is or may be a 45 flat face tangent with the portion 9. The final face 24 is a simple are joining by tangent relation to each of the portions t and m of the cam. Under these conditions it will be found that the cheeks to show that the starting from zero and stopping at zero' velocity and longitudinally of the driving shaft X, so 125 that its further rotation will not make it further engage the cheeks 16 and 17. This lateral movement of the cam is completed during the next 30 of rotation after the position of Fig. 11, and this shifting maybe no This lateral 1% advantageously started a little before the position of Fig. 11 to insure greater sinooth ness and quietness in throwing the cam lat erally to the extent desired in the interval available. It will he noted from the dotted representation of the hill 02 in Fig. 9 that this position correspond i o the direction marked 1 in Fig. 2, which; "was being the position'of the link when the stopping action of the mechanism commenced. FiglO is a position 6, O earlier than directionl of Fig. 2, and 11 is a position corresponding to where the link just arrives at the position of stoppage, direction 2 of Fig. 2 and marked a thereon.

With the foregoing analysis of the stopping action secured by the cam specifically shown in the drawings, the starting may be readily analyzed Without specific descrip tion from Figs.,7, l2 and 13. Fig. 7 shows the position of the cams when the actual pushing of the shaft from center to cen' ter 0 commences. The other cam 21 is nowv involved, while the cam 20 is entirely out of action for the moment.- It is also the other pair of cheeks or wear plates 18, 1 9, which are brought in use. In fact, in the construction as described, which is the bestconstruction, the lateral shifting of the pair of cams is in a direction on the shaft X away. from the pulley end, which movement is particularly illustrated in Figs. 6 andf8. This movement is directly opposite to the movement of the pair of cams when stopping the machine, the latter movement being toward the pulley end, but not specifically illustrated by any side elevational view. It may, however, be readily understood in view of Figs. 4 am. 5, which show the central or normal position oi"; the pair of cams, and from which position they may move either toward the left or toward. the right for stopping or starting the machine, respectively, as the case may be. in action for starting, the commencement of fit the real starting operation is the positionshown in Fig. 7, where the cam 21 begins to push the driving shaft toward its new axis, and which is further the position.

marked by the direction 2 in Fig. 2. The lateral shifting occurred in the interval prior to this, namely, the interval between the position of Fig. 12 and that of Fig. 7. The driving shaft is fully pushed over 120 after the position of Fig. 7, which is the position of Fig. 13. After this there is a further period of 30 available for a return shifting of the cams to the central or neutral position of Figs. 4 and 5.

Thus it will be understood that, after the driving shaft X is in alinement with the shaft A, as shown in Fig. 4:, the mechanism may be actuated to stop the rotation of the driven shaft A by throwing the pair of earns 29 and 21- to the left in Fig. 4, which.

was

described as When illustrated in Figs. 10, ll, 12 and 13, and

, and out of starting cam wedge,"- and vice versa, and no roller.

brings the cam 26 in conjunction creeks or l7*,. 1-8, 17'.

e s ill 3. $113.35.;

z tion where the (lllYQll slia ary, as well shown in Figs. ing n i be ed'ected o'y shiriru he pair ol- 7 car-as 1'20 and ill. to the 1' V causes engr erment ti" 3 cam 2i with checks or wear plates 18, l as particularly shown in Figs. '7, l2 and d 'lurther results in a translation of d. Join the axis 0 2, to tl axis 0. The shifting of the camsQO and 23., hoth'i or bringing them into engagement with the checks or wear plates, and out of cngagenient=- 'ththe cheeks or Wear plates, is accomplished. automatically by the machine, in the nest constructions emhodyin thev invention and as illustrated in the crawings.

"While the constructions ior this purpose may vary .considerahly,'a simple, practical arrangement is that best understood from Fig. 8. It will he observed that the cams 20 and :21 have hubs 20 and 21, preferably integral therewith, so that the two cams 20 and B1 and their res A are always in etlect an, is further illustrated. i: V slides en 9220856 on arbor 25-, which is keyed or secured to the shaft Y by any suitable key 26, (see Fig. 15). The arbor has a non-cylindrical form by key or spline 27, so that the whole cam unit, which for convenience may be designated W, can slide longitudinally onthe shaft X hut alwaysrotates therewith. [The provision of the arbor 25 is merely for the purpose of securing a greater Wearing servicev and tacilitah ing assembling, it'being evident that the cam unit /V could he splined directly to the shaft-'X, if desired. 11% Referring again to Fig. 3, the hubs 20 and 21 of the cam unit N are illustrated as being provided with certain endwise acting or, wedge cani't'aces, which are further Til which are marked B and Z and B and Z respectively, the pair B and Z appertaining to therein 20 for shifting it into and out of stopping position, respectively. On the other hand the pair B andjf" appertain to the cam-i1 for shifting it into position, respectiyely. These cam wedges acting endwise on the cam unit W cooperate with certain abutments or'rollers so disposed-that each of the 12 cam Wedges B and Z and B and 2, may cooperate with an individual one-of the four rollers, but with no other. In other words, eachroller appertains to a certain starting the machine.

rwedgecan have action except in conjunction with its own particular cooperating part. This being true and for convenience n tracing the motions. the rollers are designated b and 2 and I) and ,2, which may oe conveniently compared with the respective cam wedges B and Z and B and Z. In Fi 8 it will be seen that the cam wedge B has just been engaged with the roller 1), the highest part of the wedge now being opposite the roller. This corresponds with the position of the parts in Fig. 7, and represents. the instant when the movement of translation of the sh aft X from the center o: to the center 0 begins for the purpose oi It will be observed in Fig. (i that the cam 21 is in the plane of the cheeks or wear plates 18 and 19. The rotary motion of the cam continues until the condition of Fig. 13, at which time the cam wedge Z arrives opposite the permanently located roller 2 whereupon the cam mit V is thrust back to its middle or nor ma position, as shown in Fig. 5. From a similar consideration of Figs. 9, 1Q andll it will be seen that the cam'B tse Fig. is adapted to engage the roller 5 (see Figs. 6 and 8) about 60 prior to the position of Fig. 9, so as to thrust the cam '20 fully into the plane of the cheeks or wear plates 16. 17 when the slot-ted link a: has arrived in the position of Fig. 9. This represents the instant when the driving shaft X is begun to be thrust from the axis 0' to the axis 0 for the purpose of stopping the machine. When the parts have further rotated to the position shown in Fig. 11, which is 120 later than Fig. 9, the cam Z? has been brought into engagement with the roller 2' (see Figs. 5, 6 and 8), and the cam unitlY is thrust back again into its central or normal position, as shown in Fig. It will be understood that it continues to rotate in this condition thereafter as long as it is undisturbed, the ma chine to which the stop motion is connected being held at rest with the driven shaft in a predetermined angular position.- This angular position is that where the crank a is held directl) ODPositethe center 0 In the foregoing description it has been assumed that the various rollers 6 5, and are properly located to secure the functions described. This is accomplished in the embodiment of the invention illustrated in the drawings by providing the finally acting rollers 2 and 2 at points of permanently fixed location in the machine, which do not change. The rollers 71 and 6 are, however, capable of being shifted.

and for greater convenience are mounted on the same shifting control frame so that they always move together, or in unison. The shifting control frame is designated 29 in the various figures, and extends over a portion of the top of the casing so as to connect the one.

pivot supports of the rollers 6 and 5 These pivot supports are formed of sliders 30 and 31 for the r spective rollers 6 and 72 and the sliders are capable of vertical movement in vertical recesses 32 of the main frame. The slider 31 has an upper and lower part, (see Fig. 1), joined by a C- shaped yoke 31*, which makes the parts an integral unit in line with one another. This makes a better guide and also a convenient connection for the cross-connecting frame 29 which extends over to the other slider 30. The wholeresult is to keep the sliders 30 and 31 in easy sliding engagement in their guides, and also make them work in unison. The rollers 5 and (3 are mounted on the sliders in such respective planes that the roller 7f is entirely out of line with the cam 18 when the roller 6 is engaging its cam- B, and conversely. It will be fo11ncl,'l1ow-. ever, that the motion of translation of the driving shaft X from one axis to another results. in preventing any improper interference between the cam wedges B and B and animpropenon-of the rollers 7) and 7). This will be perceived from a consideration of the action in F igs. 10 to 13 inclusive. Assuming that one of the rollers, say

2 has been pushed down in Fig. 5. the result will be a shifting over of the cam unit W to the left in 5. The excursion to the left is only momentary, however, and there will be a return movement within about half a revolution. It is, however, not necessary for the roller 71 which started the excursion, to be taken out of'the way before this return movement of the cam unit, because in the meantime the cam unit has shifted over with the driving shaft X to the new axis 0 and in this position the cam wedge B is entirely out of'any possible engagement with the roller 6 he roller 6 may, therefore. continue in the position to which it was shifted as long as desired. Meanwhile the driving shaft continues to run with the cam unit in its middle or normal position, and the driven shaft held at rest. In a similar way, when starting, it will be assumed that. the frame 29 is lifted, which moves the roller 5 into the path of engagement with the cam wedge 13 .1 This causes thecam unity to be shifted to the right in Fig. fitor a brief interval corresponding to about half a revolution. after which it is re-- .turned to the middle position by the cam sible engagement with the roller 6 The "roller 6 can, therefore, remain in its shifted position as long as desired while the maewes. e plate are wee {re eificleney of? ueseribed is leeignect letlahy ofl-tzxh easlng 111 at grease may we browdeci hted. 1 e censidere-ble period 7 airing attention. The casing 7 '3 houses ell the movable parts, imited number of openings actually nijeliy secured against of eil or grease For ate, the

xit opening 0f the snait't X at end eenlet:v by the p! a l which recess 51, "wherein it slides, se asto lde the escape of the 033.. At the other e s'ietteci epening; 52 opens inte cavwhich, contains the slotted link at t the hearing of the driven 2. is a permanently located sealed. tight-1y as desired eq 015 Oil in any famfiiar Way. n mehnery annular hall beefing 54 is fllus- 9O it as a convenient mounting for the shaft A. The control frame 29 the top of the casing, but not at item, and gravity ant? the fit of the 1's 31 substantially prevents esthe tsp of the 0218- d opening permitting the r by the operaed in eemleetien with nature in the machine as t a brief recepitulntien oniy be required. As- 1% at the wee ine is in the condition it" wit}. note l that the @riving iii ehefts are in sflinement and the am 0.11 t ,l 'en. shaft is being mutated at speed. Un-

tion Shawn in r U81 these eenciitions depression of the con- 110 eh unit N is cYisp'iaced are inane puts the roller 5 inte a posi- "his middle position the tion Whereit engages the Wecige cmn B belt :iiso (315912025X 1h one diree- (see Fi 1G}. The further rotation of either case the drlvmg sha X Wedges the mm B l "1st the Feller end thrusts the cam unit 5e to engage the cam 20 1 17. This ef cts a 1 sheit as eeen h com- *1 of Fi s 10 315111 cL gain of Fig. he {living 5 brought from the axis 0 to the 1g. 2. This results in stepping c although the driving shaft rotate as better The driven enly stepped. but is brought Grit LL rest-,es already described, and lfl' 5 1" with the free em from shock and vlbratlen and Wear, as already described. It is fure i and held m defimte angar en arise. The subsequent startingis effected by the converse of the foregoing. namelv. T I P by hit-ing the control frame .29, which puts the roller in position to engage the cam B" see rig. l2). Under these conditions the rotation of the driving shaft X causes the cam wedge, B? to wedge against the roller i5 and thrust the cam uni-t'W to the right, b'ackwardly'in Figs. 7, 12 and 13. This results in the engagementof the cam 21 with thepla'te tl to lockthe driving shaft on its respective-axes. 'T he remaining pair of cam wedges Y21 and Z cooperate with the rollers 'z ,'and 2 as previously de scribed, torestore the cam unit Y'V toits middle position a suitable period after it has been shifted for. the urposes just .de-

scribed.

The mechanism as a. whole may be said to cc znprise a form oflink connection between the driving and driven shafts, the two being atall time linked together, the links of the connection being, however, shiftable or changeable to different relations with one another. This is' an important feature of the invention in" that it affords a rigid and non-slippingconnection,' which is free from springs and also, the uncertain effects of a slipping or brakeengagement. In this way tne'power is transmitted with greatest effectiven essfnot only during the normal running conditions, but, as 'is still more important, during the changing conditions while the driven'shaft is being brought from a condition of speedtoa condition of rest, or vice versa. It'is during this period that some of the greatest forces are generated by reason of the large effects of momentum and inertia, which have to be overcome. Hence, the importance of a mechanically rigid union at all timeswhich willnot let anything get away or get out of control, except by actual breakage of some of the parts of the, machine. Of course, the machine parts may be n1ade of steel strong enough to stand any strain put upon them, thus precluding failure from this cause.

Thus, by virtue of the rigid mechanical connection. free from yielding or slipping, and

estaolished by a link arrangement between the driving and the driven shafts, it is possible to secure a greater certainty of action.

than would be had through any yielding or elastic devices, or any devices depending a rotary driven shaft, and a transmitting means having rigid non-slipping mechanical connections for transmitting movement from one shaft to the other, and a stop mechanism comprising means adapted to be rendered operative at sultable-times for altering the position of the connect1ons to automatically change the speed ratio to effect a gradual reduction of the speed transmitted, from the full. speed condition to a condition where the driven shaft is at rest. v

2. In combination, a rotary driving shaft,

a rotarydriven shaft, and a transmitting means having rigid non-slippingmechanical connections for transmitting movement from one shaft. to the other, and a stop mecha ni'sm comprising means adapted-to be ren-- dered operative at suitable times for altering the positions of the connections to 'automatically change the speed ratio to effect a gradual reduction of the speed transmitted, from the full-speed condition to a'condition Where the driven shaft is held positively at rest in a predetermined angular position.

3. In a device of the class described, a first shaft, a second shaft, transmitting means for transmitting rotary movement from' the first shaft to the second, and means adapted to be rendered operative] at suitable times acting during. the continuing rotation of the first shaft for automatically gradually shift-' ing the parts. of the transmitting means to a condition where the second shaft becomes' and remains independently at rest.

4. In a device of the class described, a first shaft, a second shaft, transmitting means for transmitting rotary movement from the first shaft to the second, and means adaptedv to be rendered operative at suitable times acting during the continuing rotation of the first shaft for automatically gradually shifting the parts of the transmitting. means through a definite range of movement, the transmit;-

ting means connected and arranged to gradually slow down the second shaft during such shifting movement of its parts.

5. In a device of the class described, a first shaft, 21 second shaft, transmit-ting means for transmitting rotary movement from the" first shaft to the second, and means adapted to be rendered operative at suitable times acting during the continuing rotation of the first shaft for automatically gradually shifting the parts ofthe trans mitting means through a definite range of movement, the transmitting means being connected and arranged to gradually slow down the second shaft during such shifting movement of its parts and further to stop and hold at rest said second shaft at a predetermined angular position at the conclusion of such shifting movement.

6. In combination, a rotary driving shaft,

a rotary driven shaft, and a transmitting means" having rigid non-slipping mechanioperative at, suitable times Cit v the :onnectioni ca cc-nnectione for ianisni eon onerat i autoinat one shaft to the other, and a stop mechanism comprising .means mlapted to be rendered.

for automaticaliy altering the positions of the connections to effect a gradual reduction of the speed. transmitted from the tuii speed condition to a condition. Where the driven shaft is at rest, said altering means being actuated by the rotation of the driving shaft.

8. In combination, a rotary driving shaft, a rotary driven shaft and a transmitting in ans having rigid non-slipping mechanica connections for transmitting movement from one shaft to the other, and a stop mechanism comprising means adapted to be rendered operative at suitable times for automatically altering the positions or the.

connections to efiect a gradual reduction of i the sored t ansinitted from the full is eed condition to a condition where the driven shaft is at rest, the driven shaft being at all times rigidly controlled and heid from driving-shaft by rigid non-slipping niechanicai connections,

9.111 combination, a rotary driving shaft, a rotary driven shatt, and a transmitting means having rigid non-slipping cal connections for transmitting movement from one shaft to the'other, and a stop mechanism comprising means adapted to be rendered operative at suitable times for automatically altering the positions of the connections to effect. a gradual reduction of the Speed. transmitted, from-the full speed condition "to a condition Wherethe driven shaft is at rest the driven shaft being at ah '1 ice rigidly controlled and held from om -ring shaft by rigid non-slipping inecnanicai connections, said altering means heing a tuated hvthe' rotation of one of the bilziihS l 1:), 1n coinhni tion, a rotary dilVlZlg shaft, a rotary oer-Jen and a trans- .non-siipping transmitting: the other. and

mittingmeans having mechanical connections movement from one shaft a stop inechaj ism coinprisin means adapted to he rendered operative e snitabie times for autoinaticaily aitering the positions oi i to effect a gradual reduction of the speed transmitted, from the fall speed the rotation of the urnbeing actuated by ing shaft 1 '11. In combination, a rotary driving shaft a rotary driven sliaft,'and a transinitting means ha'ing rigid non-siipping mechanical connections for transmitting movement from one shaft to the other, stop mechanism comprising means adapted to be rendered operative at suitable times for automatically altering the positions the connections to eii ect a gratin-at reduction of the speed transinittcd from the tut. speed condition to a condition Where the driven shaft is'at root, said altering means being actuated by the rotation of one of the shafts, and means for-controlling the mentzonm actuation din-in operations.

12. A stop inotion for high speed inacliines comprising a driven shaft having a crank, a driving shatt movable into and out of a position coaxial with the driven shaft, and means on the driving shaft for shittahiy engagim said crank.

13 A stop motion for high speed ninchines comprising a driven shaft, having a crank, a dri *ing shaft, means on the driving shaft'for engaging said crank at Varying radiai. distances from the driving shaft, axis and'ineans for shifting the driving shaftinto and out of coaxial reiat-ion wit}. the dri shaft.

1 A stop mot-ion for high speed. Ina chines comprising a driven shaft having a cranin a driving shaft, means on the driving shaittor engaging said crank varying radiai distances roin the dr ting shaft axis, n

trolling means, for causing a shift of the driving ehattv to a new axis,

15. A stop motion for high speed niachines comprising a, driven shaft having a crank, a driving shaft, in eans'on the dri "in :3 shaft Ior'engagnig said crank at varying" radial distancee from the driving shaft axis a driving shath means on the driving engaging said crank at varying driving 5 wit toa new 17, A stop motion for high speed inachines comprising a driven .shaft having a. crank, a driving shaft, means on the driving shaft for engaging said crank at varying radial distances from the driving shaft axis,

means for holding the driving shaft axis opposite the rotativepath of said crank, and

controlling means for causing a shift of the driving shaft to a new axis coaxial with the driven shaft.

18. A stopmotion for high speed machines comprising a driven shaft having a crank, a driving shaft, means on the driving shaft for engaging said crank at varying radial distances from the driving shaft axis, means for moving the driving shaft opposite the driven shaft, and means for moving the driving shaft opposite the rotative path of said crank.

19. A stop motion for high speed machines ,comprising a driven shaft having a crank,.a driving shaft, means on the driving shaft for engaging said crank at varying radial distances from the driving shaft axis,- and means for shifting i-said driving shaft to and fro, between a position opposite the driven shaft and a .position opposite the rotative path of said crank.

20. A stop motion for high speed niachines comprising a driven shaft having a crank, a driving shaft, means on the driving shaft for engaging said crank at varying radial distances from the driving shaft axis, and'means cotirdinated to the rotation of the driving shaft for shifting said driving shaft to and fro, between a position opposite the driven shaft and a position opposite the rotative path of said crank.

21. A stop motion for 'high speed machines'comprlsing a driven shaft having a crank. a driving shaft,- means on the driving shaft for engaging said crank at varying radial distances from the driving shaft axis, and means in predetermined time relation with the rotative movement of the driving shaft for shifting said driving shaft to and fro between aposition opposite the driven shaft and a position opposite the rotative 'path of said crank. 22. A stop motion, for: high speed -machines comprising a df'iven shaft having a crank,-a driving shaft, means on the driving shaft for engaging said crank at varying radial distances from the driving shaft 3 axls, and means acting during substantially a quarterturn of the driving shaft for shifting said driving shaft from a posltion opposite saidcrank to a position coaxial with the driven shift, whereby the driven shaft is the rotative path of'said crank.

posite said crank, whereby the driven shaft is brought gradually from a condition of motion in unison with the driving shaft to a condition of rest.

.24. A stop motion for high .speed machines comprising a drivenishaft having a crank, a driving shaft, means on the drivlng shaft for engaging said crank at varyaxis, and means acting during substantially a quarter turn of the driving shaft for shifting said driving shaft within a fixed pati from a position coaxial with the driven shaft in}; radial distances from he driving shaft to a position opposite said crank, whereby the driven shaft isbrought gradually from a condition of, motion in unison with the driving shaft to a. condition of rest at a pre determined stopping position' 25. A stop motion for high speed machines comprising a driven shaft having acrank, a driving shaft, means on the driving shaft for engaging-said crank at varying radial distances from the driving shaft axis, and controlling means for causing an automatic shift of the driving shaft, between a position opposite the driven shaft and aposition opposite the rotative path of said crank.

26. A sto motion for high speed machines comprising a driven shaft having a crank, a driving shaft, means on the drivingshaft for engaging said crank at varying radial distances from the driving shaft axis, and controlling means for-causing an automatic shift of the driving shaft in predetermined time relation with the rotative movement thereof, between a positionopposite the driven shaft and a-position opposite the rotative path of said crank.-

ing radial distances from the drivingshaft axis, and controlling means for causing an automatic shift of the driving shaft in predetermined time relationwith the rotat-ive movement thereof, between a position opposite the driven-shaft and a-position opposite 28. A stop motion for high speedunachines comprising a driven shafthaving a crank, a driving shaft, means on the drivlng shaft for engaging said crank at varying radial distances from the driving shaft axis, and controlling means for causing an automatic shift of the driving shaft from a position opposite the crank to a position co-' axial with the driven shaft, whereby the driven shaft is brought gradually from a 

